Saber, Rin, Sakura, and Rider are joining the set wearing their maid outfits, while Illya and Taiga are using their outfit from the minigame. Dark Saber, Bazett, Sella, Caren Ortensia, and Steno are also included in the pack. There are one secret character in the set as well. XD

The pre-order for this set has been available today. Here is the accompanying description from the official page:

The curtain of fate has opened once more!
With Fate/Zero’s second season underway the ever Fate series is as popular as ever, and now the characters from Fate/stay night’s fan disc, Fate/hollow ataraxia are coming to join the Nendoroid Petite series!

The set includes Saber, Rin Tohsaka, Sakura Matou and Rider all wearing adorable maid outfits, along with figures of Illya, Caren, Taiga Fujimura, Bazett, Leysritt, Stheno, Saber Alter and even one secret character that you can get your hands on. Enjoy the quest for yet another Holy Grail in the cutest form possible!

Each box containing single Petit will cost you 500 Yen, and they will be available on July.